{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [],
   "source": [
    "import sys\n",
    "from os import path\n",
    "\n",
    "sys.path.append('../utils')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [],
   "source": [
    "from aoc import get_input"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {
    "scrolled": true
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'L4, L1, R4, R1, R1, L3, R5, L5, L2, L3, R2, R1, L4, R5, R4, L2, R1, R3, L5, R1, L3, L2, R5, L4, L5, R1, R2, L1, R5, L3, R2, R2, L1, R5, R2, L1, L1, R2, L1, R1, L2, L2, R4, R3, R2, L3, L188, L3, R2, R54, R1, R1, L2, L4, L3, L2, R3, L1, L1, R3, R5, L1, R5, L1, L1, R2, R4, R4, L5, L4, L1, R2, R4, R5, L2, L3, R5, L5, R1, R5, L2, R4, L2, L1, R4, R3, R4, L4, R3, L4, R78, R2, L3, R188, R2, R3, L2, R2, R3, R1, R5, R1, L1, L1, R4, R2, R1, R5, L1, R4, L4, R2, R5, L2, L5, R4, L3, L2, R1, R1, L5, L4, R1, L5, L1, L5, L1, L4, L3, L5, R4, R5, R2, L5, R5, R5, R4, R2, L1, L2, R3, R5, R5, R5, L2, L1, R4, R3, R1, L4, L2, L3, R2, L3, L5, L2, L2, L1, L2, R5, L2, L2, L3, L1, R1, L4, R2, L4, R3, R5, R3, R4, R1, R5, L3, L5, L5, L3, L2, L1, R3, L4, R3, R2, L1, R3, R1, L2, R4, L3, L3, L3, L1, L2\\n'"
      ]
     },
     "execution_count": 3,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "inp = get_input(2016, 1)\n",
    "inp"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [],
   "source": [
    "dx = [-1, 0, 1, 0]\n",
    "dy = [0, -1, 0, 1]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {},
   "outputs": [],
   "source": [
    "def y2016_d01_p1(inp):\n",
    "    d = 0\n",
    "    x = 0\n",
    "    y = 0\n",
    "    steps = [s.strip() for s in inp.split(',')]\n",
    "    for step in steps:\n",
    "        op = step[0]\n",
    "        num = int(step[1:])\n",
    "        if op == 'L':\n",
    "            d = (d + 3) % 4\n",
    "        else:\n",
    "            d = (d + 1) % 4\n",
    "        x += dx[d] * num\n",
    "        y += dy[d] * num\n",
    "    return abs(x) + abs(y)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "279"
      ]
     },
     "execution_count": 6,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "y2016_d01_p1(inp)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {},
   "outputs": [],
   "source": [
    "def y2016_d01_p2(inp):\n",
    "    d = 0\n",
    "    x = 0\n",
    "    y = 0\n",
    "    s = set([(0, 0)])\n",
    "    steps = [s.strip() for s in inp.split(',')]\n",
    "    for step in steps:\n",
    "        op = step[0]\n",
    "        num = int(step[1:])\n",
    "        if op == 'L':\n",
    "            d = (d + 3) % 4\n",
    "        else:\n",
    "            d = (d + 1) % 4\n",
    "        for i in range(num):\n",
    "            x += dx[d]\n",
    "            y += dy[d]\n",
    "            if (x, y) in s:\n",
    "                return abs(x) + abs(y)\n",
    "            s.add((x, y))\n",
    "    return -1"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "163"
      ]
     },
     "execution_count": 8,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "y2016_d01_p2(inp)"
   ]
  }
 ],
 "metadata": {
  "@webio": {
   "lastCommId": null,
   "lastKernelId": null
  },
  "kernelspec": {
   "display_name": "Python 3",
   "language": "python",
   "name": "python3"
  },
  "language_info": {
   "codemirror_mode": {
    "name": "ipython",
    "version": 3
   },
   "file_extension": ".py",
   "mimetype": "text/x-python",
   "name": "python",
   "nbconvert_exporter": "python",
   "pygments_lexer": "ipython3",
   "version": "3.8.8"
  },
  "latex_envs": {
   "LaTeX_envs_menu_present": true,
   "autoclose": false,
   "autocomplete": true,
   "bibliofile": "biblio.bib",
   "cite_by": "apalike",
   "current_citInitial": 1,
   "eqLabelWithNumbers": true,
   "eqNumInitial": 1,
   "hotkeys": {
    "equation": "Ctrl-E",
    "itemize": "Ctrl-I"
   },
   "labels_anchors": false,
   "latex_user_defs": false,
   "report_style_numbering": false,
   "user_envs_cfg": false
  },
  "toc": {
   "base_numbering": 1,
   "nav_menu": {},
   "number_sections": true,
   "sideBar": true,
   "skip_h1_title": false,
   "title_cell": "Table of Contents",
   "title_sidebar": "Contents",
   "toc_cell": false,
   "toc_position": {},
   "toc_section_display": true,
   "toc_window_display": false
  }
 },
 "nbformat": 4,
 "nbformat_minor": 4
}
